At midnight suddenly realised faster heart beats. With dry tongue and often thirst. What are possible reasons behind all these? Is it a heart related issue?
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Heart rate varies with the demand of oxygen in the body so when we exercise it gets increased and when we take rest it is at its base level. Generally there is no such reason for the heart to increase its rate at rest but the autonomic nervous system of the body which regulates heart beat may do so if its sympathetic component is stimulated due to some emotional overdrive like fear, nervousness, nightmares etc. The effect is dryness of mouth, increased rate of heart beats etc. If there is no other relevant symptom like chest pain, breathing distress etc, then should not be anything to worry else get a thorough check up to be assured.
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